反应详情

A slurry of 3-methoxy-tetrahydro-pyran-4-one (0.4 g, 3 mmol-described in WO03/093266(A1)), ammonium formate (1.9 g, 30 mmol), 10% palladium on charcoal (1 g) in water:MeOH (1:5, 6 ml) was stirred overnight after which time it was filtered through Hyflo, the mixture concentrated to remove the MeOH, the residue taken up in Et2O, dried (Na2SO4) and concentrated to afford the title product (0.2 g, 49%) as a yellow oil (contaminated by 10-20% of the trans isomer). 1H NMR (300 MHz, CDCl3) (cis isomer) δ 1.60-1.80 (2H, m), 2.95-3.00 (1H, m), 3.22-3.43 (5H, m). 3.82-3.95 (1H, m), 4.01-4.13 (1H, m).

1. filtrationwas filtered through Hyflo
2. concentrationthe mixture concentrated
3. customto remove the MeOH
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated